Removable tool holder



8 1929- ,M. E. TOBELER 1,723,824

' REMOVABLE TOOL HOLDER Filed Jan. 24, 1928 INVENTOR.

TwZzeZW 4 20 me'htwithinits'seatg Patented Aug. 6, 1929.

PATENT OFFICE.

max Emu. Tommie, orniiraorr, MICHIGAN:

REMOVABLE TOOL HOLDER.

Application filed January 24, 1928. Serial lNe 249,094.

This invention relates to a tool holder and more particularly to the class of removable tool.holders.

, The primary object of the invention is to 5 provide a chuck or tool holder used in con-- requires, in event that the said tool becomes worn, broken or otherwise damage-(l, rendering itunfitfor. further service.

- Another object of the invention is to provide, in a manner as hereinafter described a chuck o'r' tool holder of the character dey scribed provided with a key to prevent movement of the tool vwhilefin use, and further provided with both an automatic-and positive locking means to prevent the key from move- A further object of the invention is to p rovide, in. a manneras hereinafter set forth a (hack or tool holder of this character, which is extremely simple in construction, thoroughly reliable-and efiicient in its purpose, strong, durable, readily and easil y accessible forthe release of the tool held therein. and i inexpensive to manufacture and install.

\Viththe foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodiment of theinve'ntion, but it .is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the claim hereunto appended.

In the drawings wherein like reference 40 charactersv denote corresponding "parts throughout the several views I V Figure 1 is a vertical sectional view in accor-dance with this invention, through the chuck or holder showing the tool assembled therein. ,1

Figure 2 is a top plan view of the chuck or tool holder. I Referring to'the drawingsin detail A represents. .a-..portion of the punching press or --othTer machina'to which the chuck or tool holder is, attached in any desirable manner. B represents the die of the punching press and C illustrates a piece of material being perforated. The chuck or tool holder comprises a cylindrical body 3 although the shape thereof may be varied at the optionof the maker. Furthermore the size of body '3 may be varied and it may be made of any suitable material. l lxtending through and formed centrally in the body 3 is a tool socket 4: within which is removably seated the tool 5, said tool being locked therein for removability as hereinafter described.

Eccentrically arranged with respect to the rocket ft, in the body 3, is a circular cavity 6 extending through the major portion thereof and opening through one face 'of-the body 3, while .its opposite end merges into an apertr re. or passage 7 of considerably less diameter than the cavity 6. The aperture orpassage 7 opens through the oppositeface which may be termed the lower face of the body 3 of the tool holder. Movably confined within the cavity. 6 is a plunger 8 the same being acted upon by an expansion spring 9 one endv of which abuts against the plunger and the other end against the machine A. The pressure exerted upon the plunger8bythe spring automatically retains a key 11, within its seat as will be clearly understood from Figure 1 of the drawings.

The plunger 8 is provided with a cut-away portion or slot 10 on the circumferential face thereof. and said cut-away portion extends longitudinally from the lower plane face of said plunger :1 length slightly less than the diameter of the key 11. and less than the length of the plunger. The cut-away portion 10 confines the cylindrical'key 11 and said cut-away portion terminates atits upper end in a shoulder the shape of which conforms to the shape of the key, so thatv a tight contact results when the key and shoulder abut by the pressure exerted by the spring or by the positive adjustment hercinafter'to be described.

Extending longitudinally through; the walls from the top to the lower face ofthe plunger 8, and registering with the aperture 7 of the body 3, is a threaded opening 12.- The screw 13 passes through the aperture 7 andengages the threaded opening 12-o'f the plunger. In punching heavy material it is necessary to exertgreater pressure on the key than is derived from the spring. By turning the screw 13 theplunger 8 is moved downwardly until the shoulder of the cutaway portion' 10 engages and locks the key 11 to the tool 5. .The top face of the plunger '8 is provided with a centrally disposed stop 'seat as to become jammed under the plung The wall between the socket 4 and the cavity 6 is provided with a slot 14, extending the length of the cavity 6, through which the inner half of key 11 projects. Registering with slot 1% at the loxver end thereof is a semicircular key-Way 15 cut transversely across the shank of the tool to engage the inner half of key 11.- v

The tool 5-is provided with'an opening 17 below the socket and extending transversely through its walls for the purpose of insertingn bar to pry the tool from the chuck or holder in event the tool becomes jammeth 'What I claim is A, tool holder provided with a, key for securing a tool in the tool socket of said holder, a plunger frictionallyengaging said key for. automatically retainin the key in engaged position, and adj ustahle means threadably engaging in thetplunger and extending lengthwise of the tool socket for locking said plunger in key engaging position.

In testimony whereof, I atiix my signature hereto.

. MAX EMIL TOBELER. 

